a) I'm looking at buying the SpeedTest2018 from www.isswww.co.uk which I
think does everything I need in order to fill in a BS7671 design and
install cert. It's 215 quid, but can't find anyone who has used it on
google. Does it seem reasonable, and is it missing anything? It does RCD
disconnects and earth fault loop, which I
b) My existing CU (crowded 6-way fusebox with fusewire) is running both
a ring and a radial circuit both with 2.5mm wire from the same way.
Surely this can't be OK, because the radial circuit isn't protected by
the 30A fuse?
c) Is it legal to move the meter board, and anything I should know
before doing it? I've got sufficient flex in the incomers to do this,
and I only need to shift it sideways a fraction - I've got a 32cm gap
for the CU next to it, and need a couple of cm more to fit most 12 way CUs.
d) Is running two equivalently rated circuits on a suitable MCB OK? e.g.
16A MCB with two radial circuits, one for the immersion heater, and one
powering a 13A socket for the fridge-freezer? Or do I have to do a
diversity calculation before I can do this? I might need to do this if
the answer to c) is no!
e) When I change the CU, I will then have 2 lights circuits, immersion
heater, cooker, 2 rings, garage, shed, cooker. Is there any possibility
that the BCO will then moan that the 60A company fuse is inadequate and
I need to get them to improve the supply?
f) Ditto e) but I then want to add an underfloor heating circuit.